Straniner for paint spray guns



Sept. 5, 1950 A. REHN STRAINER FOR PAINT SPRAY GUNS Filed March 23, 1948 Patented Sept. 5, 1950 UNIT ED STATES i PATENT O F F l CE 2,521,094 s'raAINEn Fon PAINrsPaAY GUNs Adolf Rein, Washington, D. C. Application 'March 23, 1948,;Serial No. 16,452

This invention relates to a strainer for paint spray guns and the object thereof is to provide a novel and simple strainer adapted to be used in a container or cup employed in connection with paint spray guns to strain the paint drawn into the gun for discharge through the nozzle thereof so that clogging of the nozzle will be prevented.

Another object of the in'v'ention is to provide a strainer having novel means for holding the Wire gauze through which the paint is drawn and means associated therewith for mounting the device on the spray tube which extends into the cup or container to provide a stop lmiting the engagement of the strainer with respect to said tube.

With the above and other objects in view, my invention consists in the arrangement, combination and details of construction disclosed in the drawing and specification, and then more particularly pointed out in the appended claim.

In the drawing:

Figure 1 is a sectional top plan view of the strainer as applied to the tube leading to a spray gun,

Figure 2 is a diametrical sectional view taken on the line 2-2 of Figure 1; and

Figura 3 is a bottom plan view partly broken away.

Referring to the drawing, ii] designates the tube which is inserted in the paint container or cup of a spray gun of any well known type. rfhis tube has its lower end freely open and its upper end connects with the fiexible hose leading to the gun for diseharge of the paint in a spray through the nozzle thereof, being drawn from the container or cup through the tube usually by means l of a suction pump or otherwise and forced through the valve controlled nozzle in the uSual way. The strainer constituting the particular subject matter of my invention consists of a short outer tube ii of metal or other suitable material in which the tube IG frictionally fits or may be secured. The tube II has a stop l' at the lower end thereof which extends down into the spray gun paint container or cup near the bottom thereof. This stop is in the form of an inturned annular flange shown of angular, preferably right-angled cross section with a top shoulder or upwardly facing seat it internally of the tube I I and freely open at the inside as indicated at III. The seat l receives thereon the lower end of and forms a support for the discharge tube iii and limiting member for a -gauze, screen, reticulated,

perforated or foraminous strainer (to be later described) on, for and of the spray tube Ii), limiting the displacement thereof and preventing the 1'o1aim. (cialo-+94) .tube IE! from dropping'down or projecting below the lower end of the tube 'i `I concentrically fitted thereon.

An annular flang-e I is provided on the tube II at its upper end and is of circular form flanged or Curved horizontally outwardly from the top of the tube iii as indicated at It. A strainer 2| formed of reticulated, perforated or foraminous member or cup, such as fine screen wire or wire gauze usually of metal, such as branze, copper or the like, is formed with an outwardly directed flange 2G adapted to underlie the flange E5. An annular top plate 22 of metal orothermaterial has a central opening 23 receiving and spaced around or loose over the tube II] above the fiange I and is formed with the downwardly and inwardly curved peripheral outer edge or rim fiange IB to extend beneath the plate i and receive the outwardly directed peripheral fiange 2B of the strainer 2 therebetween in clamped position with the strainer depending therefrom to encompass the lower ends of the tubes Il and li. An annular cushion plate or rubber ring or packing| washer 24 may be inserted or interposed between flange l and plate 22 beneath the latter, and received and clamped therebetween. The inner edge portion of ring or washer 215i is directed or curved downwardly as at 25 to engage frictionally in supporting, liquid and air tight connection or contact with the periphery of the tube iii above the short tube i i and in spaced relation to the curved portion IG of the tube I I. This is due to the flexing of the inner portion or annulus 25 of washer or packing 24 upon fixing or mounting the same and attached parts and strainer on the lower end of tube I. In this manner, the paint in the container or cup of the spray gun is drawn or sucked through the strainer 2| and through the lower end of the tube IE! to be discharged from the nozzle of the spray gun after passing through said tube EO and the flexible hose usually provided on such devices, so as to remove any solid matter that may be in the paint. Of course, it is to be understood that the paint is usually strained or filtered before being used so that the present device is an extra precaution to insure the proper quantity of paint flowing and to maintain the fluid character thereof sufiiciently thin to insure proper discharge from the gun as a spray and prevent clogging.

I do not mean to confine myself to the exact details of construction herein disclosed, but claim all variations falling within the purview of the appended claim.

What I claim is:

A paint strainer for a spray gun having a contaner and a tube extending therein and freely open at its lower end near the bottom of the container, comprising a tubular open ended member engaging over the lower end portion of the spray gun tube and having means thereon engaging the tube for limiting the upward movement of said tubular member relative thereto, an outwardly extending fiange formed on the upper end of said tubular member, an annular plate overlying said fiange and loosely engagng about the spray gun tube, a downwardly and inwardly Curved rim formed on the peripheral edge of said plate forming an nwardly faoing seat adapted to receive the periphery of said fiange, a perforated cup-shaped straner member encompassing the lower ends of the tube and said tubular member and formed with an outwardly drected flange on the upper edge thereof adapted to underlie said first mentioned fiange and engage within said inwardly facing seat, and a fiexible annular cushon member disposed between said plate and said first mentioned fiange and adapted to frictionally engage about the spray gun tube.

ADOLF REIN.

REFERENCES CITED The following references are of record ln the file of this patent:

UNITED STATES PATENTS 

